For publishers trying to understand why they should care so much about Snapchat’s Discover feature, witness Dan Frommer’s fervent appreciation of “Literally Can’t Even,” one of its first content efforts. Frommer praises the show’s “short, fast-paced, funny and simple” nature, and he lauds its use of the “tallscreen” playing format and frequent edits between full- and split-screen views. Snapchat’s direct embrace of its creative restraints are precisely what’s making the content soar, he argues.